2018 Crop Protection Guide for Tree Fruits in Washington

Special Programs

Tuesday, December 18, 2018

Apple Maggot

Detection and containment of apple maggot within its present geographical limits in Washington is a high priority for the Washington State Department of Agriculture (WSDA). The area under order is delineated at http://apps.leg.wa.gov/WAC/default.aspx?cite=16-470-105

The apple maggot is found near some commercial apple production areas in Washington where it infests fruit on host trees in residential areas, parks, or in natural habitats where host trees occur.  The WSDA and County Horticultural Pest and Disease Boards coordinate apple maggot control activities in urban areas.  The purpose of these activities is to achieve local eradication of apple maggot populations or suppress them to the point where they are not a threat to commercial apple orchards.  The first table in this section gives products that can be used to control apple maggot on hosts in residential areas.

Commercial apple orchards that are in an area designated as under a quarantine for apple maggot must abide by rules for protecting apple from infestation by this pest.  While most orchards in a quarantine area do not come under a designation of “threatened with infestation”, it is possible that some may fall into this class.  The  “threatened with infestation” designation is applied to any orchard that is within one-half mile of the detection of any life stage of the apple maggot, usually the adult fly. Any orchard or production site that is infested or threatened with infestation by apple maggot must be inspected by the Washington State Department of Agriculture following accepted agency standards.

Any threatened orchard should either be monitored for apple maggot or have insecticides applied to protect the fruit from infestation.  If orchards are monitored and an apple maggot fly is detected in them then insecticide applications must be applied to protect fruit from infestation.  The apple maggot fly begins emerging in late June and continues emerging and active through September.  Products that can be used in commercial apple orchards are shown in the regular recommendation section in the period Late Spring and Summer and the Pre-harvest period. 

See General Recommendations for guidelines on table use. Read all product labels carefully.

Management recommendations for host trees in residential areas or public parks.

Tree Fruit Research & Extension Center, 1100 N Western Ave, Washington State University, Wenatchee WA 98801, 509-663-8181, Contact Us